Engraving tool



plil-ll, lg44. M. DE LA TQRRE 2,346,474

ENGRAV ING TOOL Filed March 22, 1940 747.11 may?.

INVENTOR ATTORNEYS Patented Apr. 11, 1944 N u luirili STATES PATENT`OFFICE I 1 Miguel de la Torre, New Haven, Conn., assignor,

by mesne assinments, to Burgess Battery Company, Chicago, lll.. acorporation of Delaware Application March 22, 1940,.Serial No. 325,445

(c1. 'xs-13.1) My invention relates tolnew and useful im-y 7 Claims.

provements in engraving An important object of my invention' is toprovide a tool for engraving, burning, beating, or embossing glass,metals and like materials, which may be electrically operated from anyconvenient v source oi'v current supply. i l

Another object of myinvention is to providea tool of the.above-mentioned character which includes an engraving point and meansto impart a point being suiiicient to perform the engraving operation.

Other objects and advantages of my invention,

will be apparent during the course of the follow.

ing description,

In the drawing, forming a part of this` specifi-l cation, and whereinlike numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of a device embody-,-

ing myA invention, y

Figure 2 is a longitudinal sectional view taken on the line` 2--2 ofFigure 1, I f

Figure 3 is a bottom plan view of my device,

Figure 4 is a fragmentary side elevation, showing parts in section, andillustrating a modiication of the clamping means for holding theengraving needle,

Figure 5 is a transverse sectional view taken on the line 5 5 of Figure4, and

Figure 6 is a fragmentary side elevation of my device, and ,showing anVattachment incorporated therewith for burning the surface of the work.

In the accompanying drawing, wherein for the f the end ofthe armature.

purpose ofl illustration, is shown a preferred emwhich the `coil of wirel5 is wound, and from,

which the coil isv insulatedby: thefmateriari'i 'I'hesid walls'ofthe'casing are bowed outwardly, as at I1 and I8, toaccommodate thelaterally extending portions of the core and the endsl Il of the coreextend outwardly of the casing and are adapted to be vconnected with anysuitable source of current supply. The top wall 2l o1' the casing isspaced substantially above the core and lwindings to deiine the amaturechamber 2|,

which chamber is of substantially greater depth than the armature 22arranged therein. The end 23 of theI armature is Yheld in closeproximity to l lation with the casing and to permit the opposite end 25of the armature to have a substantially free oscillatory movementbetween the top of the kcore and the top wall 20 of the casing. Anadjusting screw 26 is carried by the top wall 2l ad jacent the end 25 ofthe armature and the inwardly extending end thereof is adapted to becontacted by the armature.l The extending end of the screw may beadvanced or retracted to limitthe oscillatory movements oi' thevibratory end of the armature.

The depending tube 21 is welded, or otherwise secured, to the bottomwall of the casing below A sleeve 28, of a suitable insulating material,is snugly pressed over the tube 21 and with its upper end 28 abuttingthe bottom wall of the casing. The lower end 3l of theinsulating sleeveextends substantially beyond the tube 21 and the extending portion isenlarged and formed with an internally screw,-

threaded bore 3|, which bore is of slightly largerdiameter than is thetube 21. A bushing 32 is threadedly received within the bore 3| and thelock nut 33 is carried by the bushing and adapted to be moved intoabutting engagement with the lower end 3| of the insulating sleeve to xthe movement of the bushing in a. selected, advanced or retractedposition.

A driving rod 34 extends through the bushing, through the tube 21 andinto the armature chamber 2| below the oscillating end 25 of thearmature, and a coil spring 35 is interposed between the inner end ofthe bushing 32 and the annular collar 36 formed on the rod andperipherally engaging the inner bore of the tube 21. The resilientaction of. the spring urges the end 3i of the'driving rod into pressedengagement with the bottom face ofthe armature and acts to hold thevibrating end lof the armature against the inwardly extending 4endl o1`Qthe adjusting screw,

The portion of the driving rod extending through the bushing is enlargedto constitute a head portion 31 adapted to snugly, but slidably, engagethe inner bore of the bushing. The portion of the head extending beyondthe bushing is provided with an end recess 33 to receive the engravingneedle 3l and a set screw 4I, carried by and extending laterally fromthe head is adapted to secure the needle within the recess. Y

When an alternating current is supplied to the winding i5, a magneticfield will be created to alternately attract and repel the armature, 22.'Ihe effect on the amature will be to produce a vibratory'actuation ofthe end 25 thereof and the vibration of the amature in the abovemanne'rwill produce an axial vibration of the driving rod 34 which operatesagainst the resilient 'action of the coil spring 35. The bushing 32 maybe advanoedor retracted from the bore 3l to vary the tension of the coilspring and the adjusting screw 28 may be advanced into or retracted fromvthe armature chamber 2l to selectively position thevibrating end 25 ofthe armature. The actuation of the driving rod in the above manner willcause the engraving point 29 to rapidly vibrate against the work 4l andto etch or engrave Athe contacted surface thereof. By suitablypositioning the bushing 32 and the adjusting screw 26, the stroke of thedriving rod maybe adapted to any hardness of material being operatedupon. I have found that best results are obtained by holding the drivingrod perpendicular to the surface of the work and sliding the emzravingpoint along the surface thereof. It is`.not necessary to force the pointinto or against the surface of the work, the weight of the device plusthe vibratory motion of the point being' sufficient to hold' the pointin engagement with the surface and to produce the desired effect.

As already pointed out, the stroke Aof the driving rod may be easily andexpeditiously adjusted to the particular hardness of the material beingoperated upon, and the point 39'mayv be easily sharpened by holding thepoint at the proper angle against a piece of carborundum'jor the like.When desired, a used or broken point may be easily removed from the headof the driving rod and a new one substituted therefor.

Figure 4 illustrates a modification of the head 3l. The bushing 32 isprovided with a'substantially -square bore and the head 31 of thedriving rod is shaped to conform therewith in a manner to preventrotation of the head relative to the bushing. 'Ihe end 42 of the head istapered and provided with right-angularly disposed cuts which definegripping lingers adapted to engage the engraving point when the `chuck43 is threaded onto the head.

Figure 6 illustrates an attachment'which may be applied to the device toproduce a burning of the work 4l. The attachment comprises a stepdown'transformer 44 including the conventional core 45, primary coil 46 andsecondary coil 4l. The leads 48 and 49 of the primary coil lead to asuitable source of current supply, and theleads l and 5| of thesecondary coil are connected'to a clip 52 and a clamp 53, respectively.The clip 52 comprises 'a split sleeve 54 adapted to be snugly fitted tothe enlarged head portion 31 of the driving rod and a depending springarm 55 carried by the sleeve yand frlctionally engaging the engravingpoint. The metallic clamp 53 may be of any suitable shape orconstruction and includes cooperating jaws l. and 61 adapted to asientagrip a portion of the work 4I. The transformer 44 will provide lowvoltage current which will flow from the transformer through thesecondary lead ll to the engraving point, and, upon engage- 5 ment ofthe point with the work, the current will flow thmugh the work to theclamp 53 and through the lead 3| .back to the transformer. When thepoint is applied to the surface of the f work 4lv the vibratory movementthereof will l0 produce an arcing between the point and the work to burnthe surface contacted by the point. It is to be understood that the`form of my invention, herewith shown and described, is to be taken as apreferred example of the same, and that various changes in the size,shape and arrangement of parts maybe resorted to without `departing fromthe spirit of my invention, or

scope of the appended claims.

Having thus described my invention, I claim:

1. VAn engraving thol, comprising a casing having an elongated tubularstem, a rod extending axially through said stem and into said casing andbeing adapted to carry a tool element at the distal end thereof, avibratory hammer within said cas- 2'5 ing and adapted to move said rodtoward said distal end upon energization of said hammer, means forenergizing said hammer, and spring means cooperating with said rod tonormally hold the same in pressed engagement with .said hammer.'

` 2. An engraving tool, comprising the combination of a casing having anelongated tubular stem, an independently movable rod extending axiallythrough said stem and into said casing and being a5 adapted to carry atool element at the distal end thereof, a vibratory hammer within saidcasing and adapted to move said rod element toward said distal end uponenergizationof said hammer, means for energizing said hammer, springmeans cooperating with said rod to normally hold said rod in pressedengagement with said hammer, and adjustable means for varying thetension of said spring means. l'

3. An -engraving tool, comprising the combination of a casing having anelongated tubular stem, -an independently movable rod element extendingaxially through said stemand into said casing and being adapted to carrya tool element at the distal end thereof, a vibratory hammer within saidcasing and adapted to move said rodelement toward said distal end uponenergization of said hammer, means for energizing said hammer, anadjustable element carried by said casing and contacting said hammer toregulate-the vibratory 5.5 movement thereof, spring means cooperatingwith said rod to normally hold the same in pressed engagement with saidhammer, and adjustable means to vary the tension of said spring means.

4. An engraving tool comprising the combina- 50 tionof a casing havingan elongated tubular stem, a bushing snugly receiving the extending endof the rod and screw-threadedly received 7 within the bore ofthe stemfor axial adjustmenttherein,l aspring interposed between said projec`ltion and the bushing for holding the first-men tioned end of thev rod inpressed engagement with the hammer, said spring being selectivelytensioned by movement oi thev bushing relative to said stem, and'aneedle element mounted in the extending end of the rod.

5. An engraving tool comprising the combination of electro-magneticmeans,y a pivoted armature therefor and a rod adapted to carry a needleelement at one end and to be actuated axially at its other end by saidarmature, said rod abutting said armature at a point removed from thepivot of said armature, the end of said armature removed from said pivotbeing free to move away from said electro-magnetic means, stop means tolimit said movement of said armature away from said electromagneticmeans, casing means for said electro-magnetic means, axial guide meansfor said rod associated with said casing means, spring means cooperatingwith said rod to normally press said rod against said armature and movesaid armature away from said electromagnetic means and against said stopwhen not electrically activated, said arrangement being such that whensaid electro-nagnetic means is electriu cally activated said armature isattracted thereto against the spring pressure on said rod.

6. An engraving tool comprising the combination of a housing containingelectro-magnetic means having an armature associated with the upperportion thereof, said housing having its upper wall spaced substantiallyfrom said armature when said armature is in the activated position, saidhousing having an elongated tubular stem, a rod extending axiallythrough said stem and into said housing, said rod being adapted to carrya needle element at one end thereof, spring means cooperating with saidrod to normally press said rod into said housing and against one end ofsaid armature, said armature having its opposite end pivotally heldadjacent said electromagnetic means, said iirst end being free 'to moveand normally held away from said electro-magnetic means by said rod,said arrangement being such that when said electro-magnetic means iselectrically activated said armature is attracted thereto against thespring pressure on said rod.

7. An engraving tool comprising the combination of a housing containingelectro-magnetic means having an armature associated therewith,

.into said housing and against one end of said armature, said armaturebeing pivotally mounted with said rod abutting a portion thereof removedfrom the pivoted part, said armature being `free to moveaway from saidelectro-magnetic means when the latter isl not activated, said armaturebeing normally held away from said electro-magnetic means by said rod,said arrangement being such that when said electro-magnetic means iselectrically activated said armature is attracted thereto against thespring pressure on said rod. MIGUEL DE LA TORRE.

